V2 Dr. Shaw and Mr. Garrett on 
Thus after a few times the surfaces become normal and 
show no signs of clinging. This is quite a different effect 
from coherence, for there is now no rapidly alternating current 
passing through the contact causing coherence by fusion. 
There seems evidence here that the particles have been 
orientated by the powerful currents at the contacts when they 
were cohered. The orientation must be due to the coherence 
and not to the sundering, for it occurs after coherence, but 
not after the sundering of two surfaces which have been 
carrying a current in the ordinary way. The current-density 
at the bridge between the contacts is enormous, and it may 
be assumed that the particles composing the bridge would be 
orientated in some way so as to give maximum “conduction. 
This orientation is seen for a short time, but is unstable (just 
as are magnetic and other orientations) and disappears after 
a few makes and breaks. 
The Nature of Recoherence. 
Various tests applied :— 
(1) Recoherence is, like coherence, a solid effect, for if the 
surfaces be brought together gently at once after sundering, 
they recohere ; butif an interval, say of half a minute, elapses, 
they refuse to peeenenee ; no doubt due to the crowth of a film 
on the surfaces. 
(2) Suppose recoherence no longer occurs for a direct 
current, if the current passing through the contacts be 
reversed recoherence often occurs and is renewed once or 
twice more by reversals. This is shown below in five distinct 
Cases. 
Agnes i, 
il mp | 3. | 4. D: | 
| dyne | dyne dyne | dyne | dyne | 
ists ote D | ae D | D 7) | 
ae ee Sb | Sar T4x |) OTS | 
| ee 61X°5 | zy) “D | 9) D | 
He eee ‘D.| Rudy XK DO | R38x'd “Bill 
vineisnee R 5 | BR D 5 | R67x5 | R12~x°'S | 
Re asec R4 x5 | 39; R8 x0 | R D ‘5 
Bee 5 | 3) oD) exo 3 | 
| | 
Here R. stands for reversal of current; otherwise the 
current is direct. In the fourth case, after 3 trials with 
direct current, we have 3 with reverse and then one with 
direct ; each change develops recoherence (see fig. 3). 
ee 
